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Thin-film sheet including cellulose fine-fiber layer

A technology of microfiber and film sheet, applied in the direction of synthetic cellulose fiber, post-treatment modification of cellulose pulp, separator/film/diaphragm/spacer element, etc. , low internal resistance and other issues, to achieve the effect of taking into account thermal stability, excellent chemical stability/physical stability, and low internal resistance

Active Publication Date: 2017-08-18
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a technology that exhibits low internal resistance by forming an ultra-microporous structure by reducing the fiber diameter of cellulose as much as possible. The power storage device using this separator has a large surface area because the fibers are too fine, so it is difficult to contact with the electrode. It cannot be said that it has sufficient performance in terms of resistance to the oxidation-reduction reaction that proceeds around the separator, that is, durability.
Therefore, it does not satisfy all the required properties as a separator required in automotive applications, and both of the above-mentioned problems (1) and (2) have not yet been solved, and it has not been established that a practical method can be provided to solve the above-mentioned problems (1) and (2). 2) The technology of the separator of both

Method used

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  • Thin-film sheet including cellulose fine-fiber layer
  • Thin-film sheet including cellulose fine-fiber layer
  • Thin-film sheet including cellulose fine-fiber layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] Tencel cut yarns (3 mm long) which are regenerated cellulose fibers purchased from Sojitz Corporation were put into a cleaning net, a surfactant was added, and washed several times in a washing machine to remove the oil on the surface of the fibers. The obtained refined tencel fiber (cut yarn) was dispersed in water (400 L) so that the solid content reached 1.5% by weight, and as a disc refiner device, SDR14 type LAB REFINER (pressurized DISK type) manufactured by Aikawa Iron Works Co., Ltd. was used. ), the gap between the discs was set as 1mm, and this aqueous dispersion of 400L was subjected to knocking treatment for 20 minutes. Thereafter, beating was thoroughly performed under the condition that the gap was reduced to a level substantially close to zero, thereby obtaining a beating aqueous dispersion (solid content concentration: 1.5% by weight). Using a high-pressure homogenizer (NS015H manufactured by Niro Soavi (Italy)), under an operating pressure of 100MPa, th...

Embodiment 2

[0201] For the papermaking slurry prepared by diluting M1 of Example 1 with water to form a weight per unit area of ​​5 g / m 2 The form of the fine cellulose sheet was adjusted, and the papermaking slurry thus obtained was thrown in. In addition, the same operation was carried out as in Example 1, thereby obtaining the white fine cellulose shown in the following table 1. Thin film sheet S2.

Embodiment 3

[0203] Use high-pressure homogenizer (NS015H manufactured by Niro Soavi company (Italy)), under the operating pressure of 100MPa, directly carry out 10 processings to the knocked water dispersion (solid content concentration: 1.5% by weight) obtained in embodiment 1, except Otherwise, the same operation as in Example 1 was carried out to obtain a film sheet S3 made of white fine cellulose shown in Table 1 below.

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Abstract

The present invention provides a thin-film sheet configured from a single layer or a plurality of layers less than or equal to three layers including at least a cellulose fine-fiber layer that includes regenerated cellulose fine fibers by 50 wt% or more, wherein the thin-film sheet achieves improvements in both thermal stability (thermal coefficient of linear expansion and retention of elasticity at high temperature) and sheet strength, and is characterized in that the requirements: (1) the specific surface area equivalent fiber diameter of fibers constituting the cellulose fine-fiber layer is 0.20-2.0 micrometers inclusive; (2) the air impermeability is 1-100,000 s / 100 ml inclusive; and (3) the film thickness is 2-22 micrometers inclusive are satisfied. The present invention also provides a composite sheet, a composite prepreg sheet, a separator for power storage devices, etc., that include the thin-film sheet.

Description

technical field [0001] The present invention relates to a film sheet having a fine network structure made of cellulose microfibers, a core material for fiber-reinforced plastic films using the same, a core material for printed circuit boards for electronic materials, a core material for insulating films, and a core material Core materials, separators for power storage devices, etc. Background technique [0002] In recent years, fiber reinforced plastics (FRP: Fiber Reinforced Plastics) have attracted attention in various industrial fields as lightweight and high-strength materials. Fiber-reinforced composite materials composed of reinforcing fibers such as glass fibers, carbon fibers, and aramid fibers and matrix resins are light in weight but have excellent mechanical properties such as strength and elastic modulus compared with competing metals, so they are used in Aircraft parts, spacecraft parts, auto parts, ship parts, civil construction materials, sporting goods and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/18B32B29/00C08J5/04C08J5/24D21H13/08H01G9/02H01G11/52H01M2/16H01M50/443H01M50/489H01M50/491
CPCB32B29/00D21H11/18D21H13/08H01G9/02H01G11/52C08J5/04Y02E60/10H01M50/491H01M50/443H01M50/489C08J5/249C08J5/247Y02E60/13H01M50/409
Inventor 小野博文鹰巢修二斋藤大和
Owner ASAHI KASEI KK
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